sunday night. but look at this morning. the skies much emptier. jim lavila has the details. >> reporter: nearly a total ground stop here. the flights are canceled. almost all across the country, whether it's trains, butss, and also planes, have been canceled this morning. take a look what we have here at reagan national. this airfield, this corridor, completely empty. look at the boards over here, they become cancellation walls at the airports tell people to stay home. >> reporter: this morning, much of the nation as a standstill. the ferocious superstorm crippling much of america's transportation system. amtrak trains and airports from north carolina to boston virtually shut down. nearly 7,000 flights canceled. most either fly from or through one of the hubs in sandy's path. >> you prepare, prepare, prepare, and then they can change. >> reporter: all those cancellations are creating a ripple effect. forcing delays as far west as seattle and san francisco. stranded passengers, for the most part, taking it in stride. >> it's not the airport's fault. you can't really control the weather.